Means for treating paper



April 14, 1931. P. A. GoLLNIcK MEANS FOR TREATING PAPER Filed June 15, 1928 lllllmllllll lllllllilllll Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE PAUL A. GOLLNICK, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 SELECTOGRAPH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS MEANS FOR TREATING PAPER Application led June 15,

The main objects of this invention are to provide an improved method of coating po rous sheet material; to provide an improved method of impregnating Japanese yoshino paper with a liquid in the manufacture of stencil sheets; and to provide improved means for carrying out the aforementioned process.

An illustrative embodiment of the means for` carrying out this improved process is shown in the accompanying drawing, where- Figure 1 is a top plan of an improved coating tank showing a sheet floating on the surface of the bath.

Fig. 2 is a side elevation of the same.

Fig. 3 is a section taken on the line 3-3 of Figure 1, the dotted outline representing the raised position of the contact element.

Fig. 4 is a longitudinal section of the tank taken on the line 4-4 of Fig. 1, the dotted outline representing the position of the sheet as it is withdrawn through the wiping mechanism.

Stencil sheets for use in connection with addressing machines and analogous printing devices are generally made of porous sheet material, such as Japanese yoshino paper, impregnated with a substance impervious to ink to form a coating in which the stencil characters are cut to permit the ink to print through the fibers of the paper.

Heretofore, in the manufacture of stencil sheets, the coating has been applied to the sheet by a brush or spraying device or by immersing the entire sheet in a bath.

Applying the coating tothe sheets by the spraying or brushing process is objectionable because of the time consumed and the difliculty in handling the sheets during the application of the liquid. rIhe dipping process is objectionable because of the flimsy char-V acter of the yoshino paper.

The aforementioned objections to processes heretofore in use are cured by this improved process which consists in applying a liquid to only one side of the sheet and then applying a contact element to the other side thereof to rupture the surface tension of the liquid, thereby causing the liquid to pene- 1928. Serial No. 285,747.

trate the sheet for coating the opposite side thereof.

In carrying out this improved process, the liquid film is applied to only one side of the yoshino paper, preferably by floating the sheet on the surface of a bath of the liquid and then, as the sheet is being withdrawn from the bath, applying a contact element to the upper surface thereof.

In the form shown, the means for carrying out this improved process comprises a tank 1, adapted to contain a bath 2 of the liquid for treating porous sheets 3, and having a wiping mechanism l adjacent one end thereof, through which the sheets are drawn after being floated on the surface of the bath.

The tank 1 may be made of any suitable sizeand shape and is seated in a water jacket 5, through which warm water flows for keeping the bath at a certain temperature. The jacket 5 has an inlet conduit 6 and a drain 7.

In the construction illustrated, the wiping mechanism 4; comprises a pair of stationary supporting rods 8 and 9 and a movable contact lelement 10.

The rod 8 is rigidly secured to the side walls of tank 1 and the rod 9 is rigidly mounted on a pair of brackets 11 secured to respectively opposite sides of the tank 1 adjacent the rod 8.

The rods 8 and 9 span the tank 1 and arev disposed in spaced relation to each other to form a support, over which the lower film coated surface of the sheet is wiped as the sheet is withdrawn from the bath.

The rods 8 and 9 are arched toward the opposite end of the tank, so as to spread each sheet to smooth out the wrinkles as the sheet is wiped over the rods.

The contact element 10 comprises a rod having a mounting 12, which is pivotallyl secured to an arm 13 formed on one of the brackets 11, so as to permit the contact element to move into notches 14: formed in the brackets 11 for engaging the top surface of a sheet supported on the rods 8 and 9.

Mounted on the outer end of the rod 10, is a counterweight 15, which normally holds the free end of the rod in its raised or open position. The rod 10 is also arched, so as to conform to the rods 8 and 9.

In operation, a sheet 3 is secured at one end to a suitable clamp 16, which is held in one hand of the operator'. The sheet is then placed on theJ surface of the bath, so that only the lower surface of the sheet becomes coated with a film of the liquid. The sheet is then drawn edgewise and the forward end thereof is lifted out of the bath and placed over the rods 8 and 9.

The rod l0 is then lowered'into the recesses 14, so as to contact with the upper dry surface of the sheet and, while the rod' l0 is held in its lowered position, the sheet is wiped through the rods. The lower rods 8 and 9 remove the lsurplus liquid from the lower surface of the sheet and the Contact rod 10 breaks the surface tension of the film, thereby causing the liquid to penetrate the sheet for coating the top surface thereof.

It is to be understood that numerous details of the construction shown and steps in the process described may be varied Without departing from the spirit of this invention as defined by the following claims.

I claim:

1. A device for coating sheets comprising a tank for a liquid bath, a stationary wiping l element for supporting a sheet as it is withdrawn from the bath, said wiping element being arched for smoothing the sheet, and a contact element movable toward and away from said wiping element and adapted to engage the upper surface. of the sheet.

2. A device for coating sheets comprising a tank for a liquid bath, a stationary wiping element for supporting a 'sheet as it is withdrawn from the bath, and a contact element 'movable toward and away from said wiping element and adapted to engage the upper surface of the sheet, said elements being arched to smooth out wrinkles in the sheet.

3. A device for coating sheets comprisin a tank for a liquid bath, a pair of space wiping elements arranged to span the tank for supporting a sheet as it is withdrawn from the bath, a contact element pivotally mounted on said tank and movable into a position between said wiping elements for engaging the upper surface of the sheet, and means normally urging said contact element away from said wiping elements.

Signed at Chicago this 12th day of June,

PAUL A. GULLNICK. 

